Mark C Biderman

Insider

First SEC filing: Dec. 9, 2016 · Latest: Dec. 9, 2016

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Initial holdings The stakes this person held when they first started reporting.

Insider at

ARI selling April 29, 2025

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 23 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

23 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
April 1, 2026	ARI	A	9,587	—	—	70,374 Direct	+15.77%	Acquired	(price as of 2026-08-19)
April 29, 2025	ARI	S	10,000	$9.48	$94,800	60,787 Direct	-14.13%	Disposed	-26.4% (price as of 2026-08-19)
April 1, 2025	ARI	A	10,162	—	—	70,787 Direct	+16.76%	Acquired	(price as of 2026-08-19)
Sept. 6, 2023	ARI	S	10,000	$10.60	$106,000	66,485 Direct	-13.07%	Disposed	-34.2% (price as of 2026-08-19)
April 3, 2023	ARI	A	10,822	—	—	76,485 Direct	+16.48%	Acquired	(price as of 2026-08-19)
May 17, 2022	ARI	S	10,000	$12.68	$126,800	65,663 Direct	-13.22%	Disposed	-45.0% (price as of 2026-08-19)
April 1, 2022	ARI	A	7,062	—	—	75,663 Direct	+10.29%	Acquired	(price as of 2026-08-19)
April 26, 2021	ARI	S	7,050	$14.96	$105,468	68,601 Direct	-9.32%	Disposed	-53.4% (price as of 2026-08-19)
April 1, 2021	ARI	A	7,037	—	—	75,651 Direct	+10.26%	Acquired	(price as of 2026-08-19)
April 1, 2020	ARI	A	16,447	—	—	68,614 Direct	+31.53%	Acquired	(price as of 2026-08-19)
April 1, 2019	ARI	A	5,449	—	—	52,167 Direct	+11.66%	Acquired	(price as of 2026-08-19)
Dec. 7, 2018	ARI	S	10,000	$18.85	$188,500	46,718 Direct	-17.63%	Disposed	-63.0% (price as of 2026-08-19)
Aug. 27, 2018	ARI	S	10,000	$19.45	$194,500	56,718 Direct	-14.99%	Disposed	-64.1% (price as of 2026-08-19)
April 2, 2018	ARI	A	5,614	—	—	66,718 Direct	+9.19%	Acquired	(price as of 2026-08-19)
Feb. 20, 2018	ARI	S	10,000	$18.48	$184,800	61,104 Direct	-14.06%	Disposed	-62.3% (price as of 2026-08-19)
Aug. 1, 2017	ARI	A	2,872	—	—	71,104 Direct	+4.21%	Acquired	(price as of 2026-08-19)
April 3, 2017	ARI	A	2,668	—	—	68,232 Direct	+4.07%	Acquired	(price as of 2026-08-19)
March 2, 2017	ARI	S	15,000	$18.23	$273,450	65,564 Direct	-18.62%	Disposed	-61.7% (price as of 2026-08-19)
Dec. 29, 2016	ARI	A	15,000	—	—	80,564 Direct	+22.88%	Acquired	(price as of 2026-08-19)
Aug. 31, 2016	ARI	A	13,689	—	—	65,564 Direct	+26.39%	Acquired	(price as of 2026-08-19)
April 1, 2016	ARI	A	3,101	—	—	51,875 Direct	+6.36%	Acquired	(price as of 2026-08-19)
Dec. 29, 2015	ARI	A	10,000	—	—	48,774 Direct	+25.79%	Acquired	(price as of 2026-08-19)
April 1, 2015	ARI	A	2,900	—	—	38,774 Direct	+8.08%	Acquired	(price as of 2026-08-19)
Dec. 29, 2014	ARI	A	10,000	—	—	35,874 Direct	+38.65%	Acquired	(price as of 2026-08-19)
April 1, 2014	ARI	A	2,977	—	—	25,874 Direct	+13.00%	Acquired	(price as of 2026-08-19)
April 1, 2013	ARI	A	2,826	—	—	22,897 Direct	+14.08%	Acquired	(price as of 2026-08-19)
Feb. 27, 2013	ARI	A	5,000	—	—	20,071 Direct	+33.18%	Acquired	(price as of 2026-08-19)
Aug. 9, 2012	ARI	A	374	—	—	15,071 Direct	+2.54%	Acquired	(price as of 2026-08-19)
April 2, 2012	ARI	A	2,396	—	—	14,697 Direct	+19.48%	Acquired	(price as of 2026-08-19)
Nov. 11, 2011	ARI	P	5,000	$13.90	$69,500	12,301 Direct	+68.48%	Acquired	-49.8% (price as of 2026-08-19)
April 1, 2011	ARI	A	2,301	—	—	7,301 Direct	+46.02%	Acquired	(price as of 2026-08-19)
Dec. 1, 2010	ARI	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-19)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Dec. 9, 2016	GECCI	Common Stock	5,037	Direct